Wes Morgan and Andy King goals helped Leicester to victory against Peterborough.
The visitors had enjoyed plenty of possession in the first half but could not make the most of it as they rarely troubled keeper Kasper Schmeichel.
They were made to pay when Morgan powered home a header for his first goal for the Foxes.
Substitute King secured the win when he produced an excellent strike from the edge of the box.
Peterborough's defeat means they have not won away in the league since Boxing Day last year.
Despite their possession, it took Posh 49 minutes to get a shot on goal when Paul Taylor cut inside before hammering a strike which Schmeichel beat away.
Leicester responded almost immediately, with Morgan heading a Ben Marshall corner in off the underside of the crossbar.
The Foxes gained confidence from their opener and Jamie Vardy pulled the ball back for King to run on to and steer in a first-time shot to put them beyond Peterborough's reach.
Leicester manager Nigel Pearson:
"It was a good result, and it was a tougher game than people probably expected. Peterborough pass the ball exeptionally well and I'm sure their game plan was to keep it tight, keep possession and get us frustrated.
"It is good to get off to a winning start because we know the expectation on us is going to be there.
"We all want success here - the owners, players and the fans."
Peterborough manager Darren Ferguson:
"It was a tough opening game for us but there was a lot of positives to come out of it.
"We dominated the first half but did not create enough chances. The key moment was their first goal. It was a blatant foul. The goal gave them impetus and they got on top.
"A lot of positives, but a poor result from our point of view."
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